Koumi-jima Shuu 7 de Umeru Mesu-tachi

Seiichi Ozaki, a teacher, gets invited to a remote island where women give birth exactly one week after conception — and the island's male population has become too genetically compromised to keep things going. So the village elder has a very specific job offer for Seiichi Ozaki: become their designated... contributor. That's genuinely the setup, and the show leans into it without apology. This is a two-episode ONA from Studio Seven, and it plays exactly like what it is — a breezy hentai built around an absurd but committed premise. The rapid-pregnancy biology is treated as established island lore rather than something requiring explanation, which keeps the pacing light. Seiichi meets the island's women, learns the local customs, and the story does what the genre does. There's no heavy drama here, no moral agonizing — just a guy navigating a very unusual cultural assignment. If you've watched Resort Boin and liked that isolated-setting-with-a-loose-plot structure, this hits a similar note. Fans of Oni Chichi or Baku Ane: Otouto Shibocchau zo! who want something with a slightly more inventive framing device than usual might find the island concept a refreshing change of scenery, at least by genre standards. It's short, the premise is committed, and it doesn't pretend to be anything other than what it is. For hentai with a specific hook beyond the usual domestic setups, the Island of Childbearing is a weird enough concept to be memorable.